类存在于外部文件中 [英] Class exists in an external file

问题描述

如何检查外部文件中的课程?

How do I check an external file for a class?

我试图为我的模块设置安装功能，所以我试图让它加载目录列表，然后检查模块文件是否具有称为install的方法.因此，只有使用此方法的模块才会显示在列表中.

I am trying to setup a install feature for my modules, so I am trying to get it to load a list of directories and then check if the module file has a method called install. So only the modules with this method will be shown in the list.

到目前为止，这是我的代码:

Here is my code so far:

$output .= '<div id="module-dialog" title="Add Widget"><form id="widget-list" name="widget-list">

<select name="widgets" size="12" id="widgets-list">';

            $dirHandler = opendir('modules') or die ("Could not open module folder");

            while ($dir = readdir($dirHandler)) {
                if($dir!="." && $dir!=".."){
                    // Code to filter out modules with install class -- goes here
                    $output .='<option>'.$dir.'</option>';
                }
            }


 $output .='</select></form></div>';

模块文件名与目录名相同.例如:文件夹:Admin，文件:Admin.php

The module file name is the same as the directory name. example: folder:Admin, file:Admin.php

如果无法完成此操作，那么我想我将为安装功能创建一个单独的文件.

If this can not be done then I guess I will create a separate file just for the install function.

推荐答案

我假设您的意思是如何找出PHP文件是否定义了某个类?"

I assume you mean "How can I find out whether a PHP file defines a certain class?"

如果您可以包含要分析的每个PHP文件

这很容易:只需比较 get_declared_classes() 在包含前后:

it's easy: Just compare the results of get_declared_classes() before and after the inclusion:

$before = get_declared_classes();
include "myfile.php";
$after = get_declared_classes();
$new_classes = array_diff($before, $after);
print_r($new_classes);  // Outputs all classes defined in myfile.php

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如果您不能包含PHP文件 (例如，因为它们具有相同的类名)

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If you can't include the PHP files (e.g. because they have the same class name)

这比较棘手.如果您想正确执行操作，请 令牌器功能 可以在PHP解析器级别分析文件.运行 token_get_all()

This is more tricky. If you want to do it right, the tokenizer functions can analyze a file on PHP parser level. Run a token_get_all() on your file to find out which one to look for.

如果您的类遵循简单的约定，仅使用正则表达式检查类类名"就足够了.

If your classes follow a simple convention, simply checking for "class classname" using a regular expression might be enough.

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